Go with Xbox or PS3, simply looks better... Wii version is cheaper of course. I beat the game last night, the final boss battle is pretty intense! The Final Climb is pretty tough too (i had to look up some videos to figure out the pattern of "water wall" jumps). I still prefer the earlier PoP (the one with Elika) though, simply because it's more visually appealing. But i do like the fighting aspect of PoP:TFS, it's quite fun, not clunky as PoP.
For the Wii, i only get the first party games. If there's a choice (like PoP:TFS) i usually go with PS3. I use to get the games for Xbox over PS3, but then realized that PS3 has free on-line plays (if i choose to play, doesn't apply to PoP:TFS) and the price of used PS3 games retain higher value (due to demand and scratch prone Blu-ray discs). So basically I buy the PS3 games and sell them after platinum-ing them. If i do the same with Xbox games, i get less money back (believe it or not, there are more achievement hunters than trophies collectors, so that means more used copies of the Xbox games on the market, hence you get less money). Also, the PS3 game cases are the same size as BDs, so they line up nicely in my collection (smaller than DVDs too, hence you can sort of squeeze another layer if you have one of those adjustable shelves).
Nah, no achievements/trophies and the original PoP is just a nostalgic thing, i doubt i have the patience to play that tortuously torturing game.